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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d7215a94baef1d8770645e18095ae43a5d41b69b6491924db2a2386fc6b432d' 
  AND token = 'G4B79KP7Y4KEmgDxIpVDh4GG6k3UKb0M1CmHMVLibX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}